INGR --- Intergraph Raster Format

The Intergraph Raster File Format was the native file format used by
Intergraph software applications to store raster data. It is manifested in
several internal data formats.

Reading INGR Files

Those are the data formats that the INGR driver supports for reading:

2 - Byte Integer

3 - Word Integer

4 - Integers 32 bit

5 - Floating Point 32 bit

6 - Floating Point 64 bit

9 - Run Length Encoded

10 - Run Length Encoded Color

24 - CCITT Group 4

27 - Adaptive RGB

28 - Uncompressed 24 bit

29 - Adaptive Gray Scale

30 - JPEG GRAY

31 - JPEG RGB

32 - JPEG CMYK

65 - Tiled

67 - Continuous Tone

The format "65 - Tiled" is not a format; it is just an indication that the
file is tiled. In this case the tile header contains the real data format code
that could be any of the above formats. The INGR driver can read tiled and
untiled instance of any of the supported data formats.

Writing INGR Files

Those are the data formats that the INGR driver supports for writing:

2 - Byte Integer

3 - Word Integers

4 - Integers 32Bit

5 - Floating Point 32Bit

6 - Floating Point 64Bit

Type 9 RLE bitonal compression is used when outputting ".rle" file. Other file types are uncompressed.

The INGR driver does not require any especial file
extension in order to identify or create an INGR file.

Georeference

The INGR driver does not support reading or writing
georeference information. The reason for that is because there is no universal
way of storing georeferencing in INGR files. It could have georeference stored
in a accompanying .dgn file or in application specific data storage inside the
file itself.